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5 S K R A P H E GRINDING MAOHINE.

N0. 429,700. Patented June 10, 1890.

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(No Model.) 5 Sheets-Sheet 2. E. H. PARKS. GRINDING MACHINE.

I lllllllll Patented June 10. 1890.

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THE Nunms PEYERS co., moro-umo., msnmamu, n. c.

(No Model.) 5 SheetsSheet 3. E. H. PARKS.

GRINDING MACHINE.

Patented June 10, 1890.

min-asses I 5 Sheets-Sheet E. H. PARKS.

GRINDING MAOHINBL Patented June 10, 1890.

5 Sheets-Sheet 5.

(No Model.)

B. H. PARKS.

GRINDING MAOHINE. N0. 420.700.

I PatentedJune 10, 1890.

wxmassas UNITED STATES PATENT OFFICE.

EDYVARD H. PARKS, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE BROWN 85 SHARPE MANUFACTURING COMPANY, OF SAME PLACE.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 429,700, dated June 10, 1890.

' Application filed July 31, 1889. Serial No. 319,308. (No model.)

To all whom it may concern:

Be it known that I, EDWARD H. PARKS, of the city and county of Providence, in the State of Rhode Island, have invented certain new and useful Impr'overnents in Grinding- Machines; and I do hereby declare the following specification, taken in connection with the accompanying drawings, forming a part of the same, to be a full, clear, and exact description thereof.

The machine hereinafter described is especially designed for grinding the sides and face of a gear-wheel or the ends and periphery of cylindrical bodies simultaneously; and to that end the invention consists, primarily, in the combination and employment of three grinding-wheels with suitable mechanism for rotating the same, two of said grinding-wheels being mounted with their axes parallel to each other and so as to be adapted to grind the ends of the cylindrical body, while the third grinding-wheel is arranged with its axis at right angles to the axes of the other two and so as to be adapted to grind the periphery of said cylindrical body.

Another feature of the invention consists in giving to the two grinding-wheels which are to grind the parallel surfaces of the ends of the cylindrical body a reciprocating or toand-fro motion toward and from the axis of the arbor upon which the cylindrical body to be ground is mounted, so as to thereby grind said parallel surfaces from the periphery of said cylindrical body toward its axis.

Certain minor combinations and arrangements of parts and devices will also be described, and pointed out in the claims.

Referring to the drawings, Figure 1 is atop view of the machine. Fig. 2 is a front and Fig. 3 an end view of the same. Figs. 4 to 8, inclusive, are enlarged views of certain detached parts.

Mounted upon a suitable base A is a reciprocating carriage B, arranged to travel in suitable ways a in a direction parallel with the axis of the arbor which supports the work to be ground. Upon upward extensions A A of the base are also mounted two carriages C C, arranged to travel upon suitable ways b b in lines at right angles to the axis of the arbor which supports the work to be ground. Upon the carriages C C other carriages D D are mounted, one upon each, the said carriages D D being capable of adjustment at right angles to the direction of movement of the carriages C C, and consequently parallel with the axis of the work to be ground. Upon these adjustable carriages D D are mounted parallel to each other the shafts or spindles o a, carrying the grinding-wheels E E, respectively, for grinding the parallel surfaces ofthe ends of the work to be ground.

Upon the reciprocating carriage B is mounted another carriageD capable of adjustment in lines at right angles to the direction of movement of said carriageB, and consequently at right angles to the axis of the work to be ground, and upon this carriage D is mounted the shaft or spindle 0 carrying the grindingwheel E? for grinding the periphery of the work.

The spindles or shafts carrying the grinding-wheels are provided with suitable pulleys d, and are to be rotated by belt-connections or other suitable means. The adjustable carriages D D D carrying the grinding-wheels, are provided with suitable adjusting-screws e 6' 6 respectively, as shown in the drawings, for effecting the necessary adjustment thereof.

Upon a rearward extension A of the base A is another adjustable carriage F, capable of adjustment in lines at right angles to the axis of the work to be ground. The adjustment of this carriage F is effected by means of a spur-gear g, meshing with a rack h upon the bed or base of the machine. This spurgear g being mounted upon a shaft 1;, "which is supported in the carriage F, and which is provided at its other end with a hand-wheel j, it is obvious that the turning of this hand- Wheel in one direction or the other will serve to adjust the carriage F, and consequently the Work to be ground, to any desired position.

Mounted upon the carriage F is a shaft or spindle f, at one end of which the work to be ground (shown in the drawings at G) is to be secured. The other end of this shaft is provided with a cone-pulley H, which receives the power for driving the machine. Mounted upon this same shaft f is another pulley 1,

which is connected by a belt with a corresponding pulley J, located directly below it, as shown in Fig. 2. Upon the arbor of this pulley J is a bevel-gear 7.1, which meshes with a fellow gear 7.." on the end of the shaft K, which runs transversely of the machine. Upon the forward end of the shaft K is another bevel-gear I, which elilgages with two bevel-gears Z and Z loosely mounted upon one end of a tubular shaft L, which extends lengthwise along the front of the machine, all as shown in Fig. 1. At its other end the tubular shaft L is provided with a spurgear 721, which meshes with a fellow gear at, loosely mounted upon one end of a shaft M,

which runs parallel with the tubular shaft L.-

The gear 07? is adapted to be rotatively connected with the shaft M and disconnected therefrom by means of a friction-clutch N, which is connected with the shaft M by a groove-and-spline connection, so as to rotate therewith, but so that it can have a longitudinal motion thereon. This friction-clutch is engaged with and disengaged from the gear m by means of a thumb-nutn, as clearly shown in the enlarged view, Fig. (5. Vhen said frietion-clutch is disengaged, the shaft M may be turned by hand by means of the wheel N, as shown. The shaft M is provided at its other end with a screw-thread 0, which engages with a nut 0 upon the main reciproeating carriage B, for the purposes hereinafter described.

\Vithin the tubular shaft L s a piston or plunger 1). Mounted upon the tubular shaft L between the bevel-gears Z Z is a clutch O, which is connected to the tubular shaft by a pin or key 1). This pin or key 1) extends through the clutch O, the tubular shaft 'L, and the plunger 1), so as to rotatively connect them together. The clutch and the plunger are also by means of said key connected so as to move together longitudinally, the key occupying a longitudinal slot in the tubular shaft L, as clearly shown in the enlarged view, Fig. 7, whereby the plunger and clutch thus keyed together may be moved longitudinally with relation to the tubular shaft. Keyed to the other end of the piston or plunger 1) is a flanged collar 1, which slides loosely on the tubular shaft L, Fig. 1, said flanged collar being connected with the tubular shaft and the piston or plunger in precisely the same manner as the clutch O at the other end is connected. Embracing this flanged collar P is a forked arm q, attached to a rock-shaft q, extending to the front of the machine. At its forward end the rock-shaft q is provided with a lever g Figs. 1 and .t, which maybe operated by hand, and which is also arranged to be operated automatically by the operation of the machine, as hereinafter described.

The main reciprocating carriage B is provided on its rear side and adjacent to each end with toothed racks v 1", (best shown at Fig. 1,) which engage, respectively, with the gear-wheels 2' 7", which in turn engage with racks r r, secured to the reciprocating carriages O C, respectively. The purpose of this rack-and-gear connection is to give a reciprocatin g motion to the said carriages O C, and consequently to the grinding-wheels E E, toward and from the axis of the work to be ground. As shown in the drawings, Fig. l, the racks r and r are placed upon opposite sides of their respective gears r and 7", so that the reciprocating movements imparted to the carriages C G and grinding-wheels E E will be in opposite directions-that is, so that when one of said carriages with its grinding-wheel is traveling in one directionas, for instance, toward the axis of the work to be groundthe other carriage and its grinding-wheel will be traveling in the opposite direction or away from the axis of the work to be ground. One result of this arrangement of the travel of the two carriages referred to is that by correspondingly timing the-reciprocating movement of the grinding-wheel E which grinds the periphery of the work, said grinding-wheel IE will always have a free and unobstructed path to travel in, first on one side and then on the other, without interfering with either of the grinding-wheels E or .1.

The front edge of the main reciprocating carriage 1- is provided with a T-slot s, in which are adjustably secured two dogs or stops 3' 5 Figs. 1 and l, one on either side of the lever which steps may be adjusted and clamped in any desired position with reference to said lever. These stops 5 s", as the main carriage B reciprocates to and fro, engage alternately the lever g and move it from one side to the other. To insure the throw of the lever g and to prevent its resting on a dead-center, this lever is provided with an attachment. (Best shown in the enlarged views, Figs. 4. and 5.) At its lower end the lever g is thickened or provided with an enlargement, as at If, in which enlargement is bored a vertical chamber or recess t, in which is fitted a plunger '6 actuated by a spring t, the tendency of the spring when compressed being to throw the plunger upward. The upper end of this plunger t is beveled on each side, as shown, and when thrown forward by the spring this beveled end engages with a stud u, secured to the base of the machine. The acting face of this stud u is likewise beveled or rounded, so that the beveled face of the spring-plunger may readily pass the same.

The operation of the machine is as follows: The work to be groundas, for example, a gear-wheel, as G-being mounted upon the arbor on the shaft f provided to receive it, power is applied to the cone-pulley II and also to the pulleys (Z upon the shafts or spindles c 0 c carrying the grinding-wheels E E E respective] y, to revolve them. The revolution of the cone-pulley Hand the shaft upon which it is mounted will give rotation to the work to be ground, and will also, through the connecting-pulleys I J, bevel-gears k 7c, and shaft K, give rotation to the bevel-gear land the two bevel-gears Z Z loosely mounted on the tubular shaft L. The clutch 0 between the bevel-gears Z Z being in engagement with one of said gears, it is obvious that revolution will be thereby imparted to the tubular shaft L by reason of the fact that the said clutch is connected to said tubular shaft, the revolution of the bevel-gear giving rotation to the clutch in engagement therewith, and the clutch in turn giving rotation to the tubular shaft. The'revolution of the tubular shaft L will, through the spur-gears m m and the clutch N, impart rotation to the shaft M, the rotation of the screw-threaded portion of which will, by its engagement with the nut 0', give a longitudinal movement to the main carriage B of the machine and a correspondin g movement to the carriage D and the grindin g-wheel E in a direction parallel to the axis and across the periphery of the work to be ground. The longitudinal movement of the main reciprocating carriage B will, by means of the racks r r, gear-wheels 1' T and racks r W, give motion to the reciprocating carriages C 0, one in one direction and the other in the other, and a corresponding movement to the carriages D D and the grinding-wheels E E,

the one toward and the other from the axis of the work to be ground. The adjustable carriages D D, with their respective grindingwheels, may be moved or adjusted in lines parallel with the axis of the work to be ground, and the adjustable carriage D with its grinding-wheel, may be moved or adjusted in lines at right angles to the axis of the work to be ground, by means of the adj ustingscrews e 6 6 respectively, which screws also serve to hold the said carriages in the desired positions when adj usted. The adjustable carriage F, together with the shaftf mounted thereon, and to which the work is secured, may be moved or adjusted in lines at right angles to the axis of the work to be ground by means of the hand-wheel j, shaft 1', gear g, and rack h. It will thus be seen that each of the grinding-wheels has a reciprocating motion imparted to it automatically by the operation of the machine, and also that the position of each of said grinding-wheels as well as of the work to be ground may be adjusted relatively to each other. hen, now, the main reciprocating carriage B has moved sufficiently far in one direction, it is obvious that the lever will be actuated by means of one of the stops 5 s? on the front edge of said reciprocating carriage, and that thus, through the said lever the rock-shaft q, the forked arm q, and the flanged collar P,which is keyed to the piston or plunger 10, the said piston or plunger p, and the clutch O, to which it is keyed, will be moved in a direction to disengage the said clutch from that one of the two bevel-gears Z Z with which it has theretofore been in engagement and to engage it with the.

other one of said bevel-gears. As the reciprocating carriage B, however, is a slow-mov ing carriage, it does not acquire any substantial momentum of its own, and it is evident that if no other provision were made for disengaging and engaging the clutch O the machine would be liable to come to a standstill that is to say, if the clutch were disengaged by the movement of the reciprocating carriage B, said carriage, when the clutch was thus disengaged,' having acquired no substantial momentum, would be liable to come to a standstill, and there would be nothing to cause the engagement of the clutch with the other bevelgear, with the result that the entire machine would stop. To guard against this the forked arnr q is arranged to have a certain amount of play or lost motion between the flanges of the collar P, so that there may be a movement of the forked arm q, and consequently of the lever g without producing a disengagement of the clutch. By properly regulating the amount of this lost motion between the forked arm q and the flanges on the collar 1? the parts may be so arranged that the movement of the reciprocating carriage B will, by means of one of the stops 8 3 move the lever g up to and slightly past the vertical and until the beveled end of the spring-plunger t has passed thelowest point on the stud it without disengaging the clutch O, and thus without stopping the machine. Thereupon the plunger 6 will be thrown forward by the force of the spring i and thus by the action of the beveled face of said plunger on its engaging-stud u the necessary further movement will be given to the lever 11 to disengage the clutch from one of the bevel-gears and engage it with the other.

It is obvious that the two bevel-gears Z Z both of which are in engagement with the bevel-gear Z, but upon opposite sides thereof, will be thereby revolved in opposite directions, and that when the clutch O is thus disengaged from one of said bevel-gears and engaged with the other the direction of revo- .of the carriages O O and the grinding-wheels E E, causin that one which previously traveled toward the axis of the work to be ground to travel away therefrom, and vice versa. Thus the parts will continue to move in the directions last imparted to them until the reciprocatingcarriage B in its travel causes the other dog or stop 8 or s to actuate the lever g in a reverse direction, when the clutch 0 will be again shifted and the movements of the parts thus again automatically reversed, the reciprocating table Bin its moveadjusted as desired.

If it is desired to reciprocate the main carriage B by hand, the friction-clutch N is disengaged by unscrewing the thumb-nut 01, thus disconnecting the power from the screw-shaft M, and thereby enabling it to be turned by hand by means of the wheel N.

As will be seen, the machine above described is especially adapted for grinding the sides and faces of gear-wheels and other cylindrical bodies.

The machine is automatic in its action, is capable of all necessary adjustments, and the various parts may be easily and quickly manipulated.

What I claim as my invention, and desire to secure by Letters Patent, in machines for grinding gear-wheels or like cylindrical bodies, is

1. The combination of three grindingwheels, each mounted upon an adjustable carriage, two of said carriages, and consequently the grinding-wheels mounted thereon, being adjustable in lines parallel with the axis of the work to be ground, and the third carriage, with its grinding-wheel, being adjustable in lines at right angles to the axis of the work to be ground, and means for eifecting the necessary adjustments, substantially as described.

2. The combination of three grindingwheels, each mounted upon an adjustable carriage, two of said carriages, with their grinding-wheels, being adjustable in lines parallel with the axis of the work to be ground, and the third carriage, with its grinding-wheel, being adjustable in lines at right angles to the axis of the work to be ground, and a wor supporting spindle also mounted upon an adjustable carriage, capable of adjustment in lines at right angles to the axis of said worksupporting spindle, with means, substantially as described, for effecting the adjustment of each of said carriages, whereby each of said grinding-wheels, as well as the work to be ground, may be adjusted relatively to each other, substantially as described.

3. The combination of three grindingwheels, two of said grinding-wheels being mounted with their axes parallel to each other and at right angles to the axis of the work to be ground and the third grinding-wheel being mounted with its axis parallel with the axis of the work to be ground, with means, substantially as described, for giving to the two grinding-wheels whose axes are parallel to each other a reciprocating or to-and-fro motion toward and from the axis of the work to be ground, whereby said two grinding-wheels may act to grind the parallel surfaces of the ends of a cylindrical body from its periphery toward its axis, and vice versa, substantially as described.

4. The combination of three grindingwheels, two of said grinding-wheels being mounted with their axes parallel to each other and at right angles to the axis of the work to be ground and the third grinding-wheel being mounted with its axis parallel with the axis of the work to be ground, with means, substantially as described, for giving to the two grinding-wheels whose axes are parallel with each other a reciprocating or to-and-fro motion toward and from the axis of the work to be ground, but in opposite directions, whereby as one of said grinding-wheels is traveling from the periphery of the cylindrical body to the ground toward its axis the other will be traveling from the axis of the body toward its periphery, substantially as described.

5. The combination of a main reciprocating carriage and two independent reciprocating carriages adapted to travel in lines at right angles to the line of travel of the main carriage, with means, substantially as described, for connecting the main reciprocating car riage with the two independent reciprocating carriages, whereby the movement of said main carriage will impart a movement to each of said two independent carriages in lines at right angles to the line of travel of said main carriage, substantially as described.

6. The combination of a main reciprocating carriage and two independent reciprocating carriages adapted to travel in lines at right angles to the line of travel of the main carriage, with means, substantially as described, for connecting the main reciprocating carriage with the two independent reciprocating carriages, so that the movement of said main carriage will impart a movement to each of said two independent carriages in lines at right angles to the line of travel of said main carriage, but in directions opposite to each other, whereby as one of said independent carriages is traveling in one direction the other independent carriage will be traveling in the opposite direction.

7. The combination of a main reciprocating carriage and two independent reciprocating carriages adapted to travel in lines at right angles to the line of travel of the main carriage, adjustable carriages mounted one upon said main reciprocating carriage and one upon each of said two independent reciprocating carriages, each of said adjustable carriages carrying a grinding-wheel, said main carriage being provided with racks meshing with spur-gears, and each of said spur-gears meshing in turn witharack upon each of said independent reciprocating carriages, whereby the movement of said main carriage will impart a movement to each of said two independent carriages in lines at right angles to the line of travel of said main carriage, substantially as described.

8. Thecombination of amainreciprocating carriage, two independent reciprocating carriages connected to said main carriage, so that a movement of said'main carriage in either direction will impart a movement to each of said two independent carriages in lines at right angles to the line of travel'of said main carriage, adjustable carriages mounted one upon said main reciprocating carriage and one upon each of said two independent reciprocating carriages, each of said adjustable carriages carrying a grinding wheel, and means, substantially as described, whereby when said main reciprocating carriage has reached a predetermined point in its travel in either direction the direction of its movement, and consequently the direction of movement of each of said two independent reciprocating carriages, will be automatically reversed, substantially as described.

9. The combination of amain reciprocating carriage, two independent reciprocating carriages connected to said main carriage, so that a movement of said main carriage in either direction will impart a movement to each of said two independent carriages in lines at right angles to the line of travel of said main carriage, adjustable carriages mounted one upon said main reciprocating'carriage and one upon each of said two independent reciprocating carriages, each of said adjustable carriages carrying a grinding-wheel, and a reversing-lever for reversing the direction of movement of said reciprocating carriages, said reversing-lever being actuated in the first instance by a dog or stop attached to the main reciprocating carriage, and the final movement of said lever being effected by means of a spring-plunger engaging with a stud upon the frame of the machine to disengage a shifting clutch from one of a pair of bevel-gears and engage it with the other, substantially as described.

EDWARD H. PARKS. Witnesses:

W. H. THURSTON, L. J. MURPHY. 

